c++ - Does pointer arithmetic have uses outside of arrays?

Question

I think I understand the semantics of pointer arithmetic fairly well, but I only ever see examples when dealing with arrays. Does it have any other uses that can't be achieved by less opaque means? I'm sure you could find a way with clever casting to use it to access members of a struct, but I'm not sure why you'd bother. I'm mostly interested in C, but I'll tag with C++ because the answer probably applies there too.

Edit, based on answers received so far: I know pointers can be used in many non-array contexts. I'm specifically wondering about arithmetic on pointers, e.g. incrementing, taking a difference, etc.

Answer 1

Pointer arithmetic by definition in C happens only on arrays. However, as every object has a representation consisting of an overlaid unsigned char [sizeof object] array, it's also valid to perform pointer arithmetic on this representation. For example:

struct foo {
    int a, b, c;
} bar;

/* Equivalent to: bar.c = 1; */
*(int *)((unsigned char *)&bar + offsetof(struct foo, c)) = 1;

Actually char * would work just as well.